20 



with red slate and fossiliferous oolitic limestone at its top 

 and intercalating phyllitic slate near its base. 

 (Unconformity) 



Lower Cambrian : total thickness 1500 m. 



3. Red slate with Redlicliia. 



2. Siliceous sandstone. 



I . Very thick complex of marly limestone. 

 (Unconformity) 

 Precambrian. 



The Cambrian fossils now at hand are very numerous, but almost all of 

 them are derived from Manchuria, Shan-tung and Korea, and hence are not 

 taken into consideration in the present paper. Thus we have only four forms 

 to be treated at this place which are derived from three different localities ; 

 of these fossils, three are surely Cambrian, while one is referred to Cambrian 

 with a query. 



1. Dark grey earthy limestone from Ta-shi-tou, Hui-tso-hsien, prov. 



Yun-nan^^ (Yamada Coll. No. 76), with 

 Helcioiuila riigosa pan per a Billings. 

 OrtJiolJicca glabra Walcott. 



2. Light grey compact Hmestone collected between Hou-ping and Mon- 



chia-ho, Hsing-shan-hsien, prov. Hu-pei-^ (Noda Coll. No. no.) 

 with 



Coscinocyathus cfr. caiiccllatits Bornemann. 



3. Dark grey compact calcareous argillite from Lan-hsi, Chen-chou-fu, 



prov. Hu-nan (coll. by K. Kobavashi), with a trilobite, gn. et sp. 

 indet. 



The Cambrian age of the last is very doubtful ; although the single frag- 

 mental thorax reminds one somewhat of Ptyclioparia, yet there is no other 

 convincing evidence, palaeontological or stratigraphical, in support of this as- 

 sumption. The second specimen has specially an important bearing on the 

 geology of the middle course of the Yan-tze-kiang ; this will be ex- 

 plained in Chapter III. 



